All the terrible unwalkable cities in the US are called that because you can’t actually walk to anything useful. In other words, those cities that require a car to do errands, go shopping, get to work, go to school, etc.

But for exercise—walking for walking’s sake—it’s usually doable. It is nice if you can get the walking “for free” by combining it with ordinary life, though

There are no sidewalks in my parents' suburban neighborhood. You just walk among the houses, and there is nowhere to go. It's no surprise that we spent our childhoods at the mall.

These dead neighborhoods are connected by high traffic roads, also with no sidewalks, each more boring than the last, each loud and dangerous.

In Germany, wherever you go, there are little paths. They go along fields and streams, between houses, from park to park. It's easy to find a pleasant place to walk from your home. It's something I dearly miss when I visit the home country.